A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black
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A.soft clay
B.hard mud
C.very soft mud
D.sand
A.immediately after restoring vital services
B.immediately
C.following control of flooding
D.following establishment of fire boundaries
A.prevailing westerlies
B.horse latitudes
C.trade winds
D.subpolar low pressure belts
A.Weather side
B.Leeward side
C.Upwind side
D.Crosswind side
A.When at anchor，the pilot vessel is only required to sound anchor signals
B.The identification signal must be sounded any time the pilot vessel is underway
C.The pilot vessel may only sound the identity signal when making way
D.All of the above
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Consideration should be given in planning for the mooring orientation in a new location so that in adverse weather a crane is available to off-load the supply vessel on what side of the unit?（）
Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.
Clouds form（）.
Charts showing the coast of Mexico are produced by the United States（）.
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
Coiling new rope against the lay，bringing the lower end up through the center of the coil，then coiling with the lay，in order to remove the kinks，is known as（）.
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
Corrosive liquids and acids should have which kind of label?（）
Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.
Clouds with the prefix “nimbo” in their name（）.